wilmot



(-No Model.)

METHOD OF ATTAU'HING PLATES TO TUBES. No. 407,982. Patented July 30,1889.

Ill #755555 N vnzns. homume m c.

UNITED STATES PATENT OFFICE.

SAMUEL R. \VILMOT, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO THE IVILHOT &HOBBS MANUFACTURING COMPANY, OF SAME PLACE.

METHOD OF ATTACHING PLATES TO TUBES.

SPECIFICATION forming part of Letters Patent No. 407,982, dated July 30,1889.

Application filed January 28, 1889. Serial No. 297,760. (No model.) I

To all whom it may concern: drawing the tube from the original disk toBe it known that I, SAMUEL It. WILMOT, a anneal and pickle the blank anumber of citizen of theUnited States, residing at Bridgetimes, theoperation as a whole requiring export, in the county of Fairfield andState of pensive machinery and skilled labor, thereby,

Connecticut, have invented an Improved as so many operations arerequired, greatly Method of Attaching Plates to Tubes; and I increasingthe costof production.

do hereby declare the following to be a full, By the use of my novelmethod, which I clear, and exact description of the invention, havedeveloped by a series of experiments, I

such as will enable others skilled in the art to am enabled to takeordinary tubes rolled from To which it appertains to make anduse-thesame. sheets of metal and plates as they are re- My invention hasfor its object to devise a ceived from the punches and attach themtonovel method of attaching plates to tubes, in gether at a singleoperation in such amanner which the plate shall be closed inward uponthat the seam in the tube is closed firmly tothe tube instead of thetube being opened gether and retained thereagainst the possi- 15 outwardto engage the plate. This is of esbility of opening in ordinary use. Ithuspropecial importance where the tube is rolled duce a combined plateand tube as solid as if from a sheet of metal, the result of my noveldrawn from a disk of metal, which overcomes method being to close thescam in the tube the objection of separated parts, while at the firmlytogether and to prevent the possibility same time I avoid the variousoperations of 20 of its being opened in use, the tube and plate drawing,annealing, pickling, &c., which being for all practical purposes thesame as if makes the integral plates and tubes so exdrawn integral.pensive to produce.

It will of course be understood that my in- In the drawings forming partof this specivention is applicable in all places where it fication,Figure 1 is a View, partly in eleva- 2 5 maybe required to attach aplate to a tube tion and partly in section, which fully illusas, forexample, in caster plates and tubes, trates the means by which my novelmethod which I have selected as ameans of illustrat may be carriedinto'effect; Fig. 2, an elevaing my present invention. Heretofore thetion of the tube detached, showing the mantubes and plates offurniture-casters of this ner in which it is formed and the way the top30 class have been made in two ways. In one is closed; Fig. 3, a View oftheplate detached, form the tube and plate are formed sepaand Fig. 4E isan elevation of the combined rately,and are shipped to thefurniture-nianutube and plate as secured together by my facturer in thiscondition, the parts being asnovel method. sembled at the time thecasters are placed in 1 denotes a caster-tube formed in any suit- 3 5the articles of furniture in which they are to able manner, ordinarilyby rolling up a sheet be used. This form is open to the objection orstrip of metal. This tube is usually proof there being so many differentparts and vided with a bead 2, which is formed in the the necessity forhandling and assembling sheet in the operation of rolling, or after thethese different parts by the furniture-manurolling, if preferred, thatbeing wholly imma- 40 facturer when they are used, itbeing of courseterial so far as my present invention is con- 0 understood that it isalways preferable that cerned. I the parts of manufactured articlesshould be 3 is the ordinary spring-tongue, by which assembled by theoriginal manufacturer and the caster-shank is held in place, and 4 adisk that the user of the completed article should of metal closed in atthe top of the tube, so

45. having nothing to do but to attach it in place. as to form a solidhead. 9 5 Another form which avoids the objection 5 is a caster-plate,which is struck out and specified has been to draw both plate and formedto the shape shown by a single operatube from a single disk of metal.This form tion. The outer edge is ordinarily depressed is open to theobjection of the great expense and notched, as shown in Fig. 2, so thatwhen 50 of production, it being of course necessary in inverted it maybe readily driven into the IOC be understood that'these details ofconstruction have nothing whatever to do with the principle of myinvention. I have merely referred to these details in order toillustrate the principle of my invention and to explain its application.The parts are assembled by passing the closed end of the tube throughthe opening in the plate, bead 2 resting on the depressed portion in thecenter of the plate when the parts are inverted, as in Fig. 1. The plateand tube are then locked firmly together by closing the depressedportion of the plate against the tube. bly accomplished by suitabledies, as illustrated in Fig. 1.

7 denotes the lower die, which is provided with a central opening 8,which just receives the tube, and is countersunk at the top to receivethe depressed portion of the plate.

9 denotes the upper die, theunder side of which inclines outwardslightly toward the center, and is provided with a central hub 10, whichpasses freely within the tube, but does not expand it in the slightest.

Fig.1 shows the exact position the tube and plate assume when placed inthe lower die. It will be seen that both parts rest entirely upon thedepressed portion at the center of the plate. The upper portion is shownin the.

act of descending at just the position in which This is preferatheoperation of closing the plate inward upon he tube commences. It will beseen that as the upper die descends the outwardly-curved portion of theplate will be pressed down into contact with the lower die, while at thesame time the tube will be forced downward. The tube, however, will beprevented from expanding in the slightest by its engagement with thesides of opening 8, so that the compression can only be exerted upon thede pressed portion of the plate. This depressed portion is closed upwardand inward tightly against the tube, so that when the upper die israised and the article removed from the lower die the plate and tubewill be found to be rigidly and firmly attached together, the attachmentbeing as solid for all practical purposes as if they were made in asingle piece. Having thus described my invention, I claim The method ofattaching plates to tubes, which consists in forming a bead at the endof a tube and a central opening in a plate, the metal around saidopening being depressed,

. substantially as shown and described, then passing the tube throughtheopening in the plate until the bead rests upon the depressed portionthereof, and then closingthe metal of said depressed portion inward uponthe tube, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

SAMUEL R. WILMOT. Witnesses:

A. M. WoosTER, ETTA F. PETTI'I.

